Sink



FIG. 1 is a first perspective view of a sink showing our new design;

FIG. 2 is a second perspective view of FIG. 1;

FIG. 3 is a front elevational view of FIG. 1;

FIG. 4 is a rear elevational view of FIG. 1;

FIG. 5 is a left side view of FIG. 1;

FIG. 6 is a right side view of FIG. 1;

FIG. 7 is a top plan view of FIG. 1; and,

FIG. 8 is a bottom plan view of FIG. 1.

The broken lines in the drawings depict portions of the sink, which form no part of the claimed design. 

CLAIM The ornamental design for a sink, as shown and described. 